Question

Which changes occur when Pt2+ is reduced?

Answer 1

Answer: Option (2) is the correct answer.

Explanation:

When an element or compound gain electrons then this means the element is undergoing reduction.

Also, in reduction oxidation number of the element decreases.

For example, $Pt^{2+} + 1e^{-} \rightarrow Pt^{+1}$

Thus, we can conclude that the $Pt^{2+}$ gains electrons and its oxidation number decreases.

Answer 2

The correct answer is option 2. When Pt2+ is reduced it loses electrons, oxidizing it. The oxidation number is the charge of the atom. Adding an electron, decreases the net charge consequently the oxidation number.